JP2005107225A - Device and method for displaying image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for displaying an image permitting to simplify a positional configuration of an optical system such as a light source and a color composition mechanism even in the case of using a light modulation element of a one-dimensional spatial modulation type configuration. <P>SOLUTION: This is an image display device for displaying an image by generating modulation light by modulating each light from light sources of different wavelengths by light modulation elements 3R, 3G, and 3B, respectively, and synthesizing the modulation light by a color synthesizing mechanism 4, and is composed by arranging at least triangular prisms 2R, 2G, and 2B opposed to the light modulation elements 3R, 3G, and 3B as one-dimensional spatial modulation type configuration. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is an image display device and an image display method suitable for application to a projector-type display device, a printer, etc., and is particularly suitable for application when the light modulation element has a specific incident / exit angle. The present invention relates to an image display device and an image display method.

  In various image display apparatuses such as projectors and printers, as a method for increasing the resolution of an image, a light beam from an image display light modulation element having a one-dimensional spatial modulation type structure is projected onto an image forming unit while being scanned by an optical scanning unit, A method of forming a two-dimensional image is known (see, for example, Patent Document 1).

  As this one-dimensional spatial modulation type light modulation element, GLV (Grating Light Valve) developed by US Silicon Light Machine (SLM) is known (see, for example, Patent Documents 2 and 3).

  The GLV is composed of a phase reflection type diffraction grating using light diffraction. As an example of the GLV, as shown in FIG. 10, for example, six strip-shaped ribbon elements are constituted by a first surface 30a composed of, for example, three movable ribbons and a second surface 30b composed of a fixed ribbon. These first and second surfaces 30a and 30b are alternately arranged.

  By applying an appropriate voltage between the common electrode 32 on the substrate (not shown) side and the first surface 30a (movable ribbon) for the GLV having such a configuration, the first surface 30a has an appropriate amount of substrate. A diffraction grating for incident light is formed by moving to the side and deforming, that is, by moving relatively.

  The operation of the first surface 30a in this GLV has an advantage that a high-speed switching operation is possible because the width and length are as small as about 25 μm and 200 μm, respectively. Furthermore, since the reflectance of the diffracted light can be changed in accordance with the display of a wide bandwidth, that is, the moving distance of the movable ribbon, and a high degree of modulation with a change in the amount of light can be realized, a low operating voltage and a small image with high resolution. A display device can be provided.

  In this way, the one-dimensional spatial modulation type light modulation element is compared with a case where a two-dimensional spatial modulation type light modulation element such as DMD (Digital Micromirror Device: Texas Instruments) using a liquid crystal panel or a micromirror is used. For example, in GLV, since a diffraction grating is configured to perform optical modulation, it is necessary to arrange an optical system with a specific incident / exit angle, and the arrangement configuration of the optical device is limited, making it difficult to reduce the size. There is.

At present, the color synthesis of light emitted from a one-dimensional spatial modulation type light modulation element is composed of a plurality of glass plates having wavelength selection films and a plurality of mirrors for adjusting the angle of illumination light. In this case, in order to simplify the arrangement adjustment of the illumination optical system, the arrangement positions of the illumination optical systems of the respective wavelengths cannot be orthogonalized, or the color composition mechanism cannot be unitized.
In particular, in the case of using the above-described GLV type light modulation element, since light modulation is performed using diffracted light, it is necessary to adjust the incident angle of light to the light modulation element and the emission angle of diffracted light, There is a problem that the arrangement of the light source and the color composition mechanism is complicated.

US Pat. No. 5,982,553 US Pat. No. 3,164,824 US Pat. No. 5,941,579

  The present invention solves the above-described problem, and even when a light modulation element having a one-dimensional spatial modulation type configuration is used, an image display capable of simplifying the arrangement configuration of an optical system such as a light source and a color composition mechanism An object is to provide an apparatus and an image display method.

  In order to solve the above-described problems, an image display device according to the present invention generates modulated light by modulating light from light sources having different wavelengths by light modulation elements, and displays an image by synthesizing the modulated light by a color composition mechanism. In this image display device, the light modulation element has a one-dimensional spatial modulation type structure, and at least a triangular prism is disposed opposite the light modulation element.

  According to the present invention, in the configuration described above, the light modulation element has at least a first surface and a second surface, and the diffraction grating structure is changed by relatively moving the first surface and the second surface. For example, the light modulation element having the above-mentioned GLV type structure that is light-modulated by the above-described structure is used.

  Furthermore, according to the present invention, in each of the above-described configurations, the triangular prism is provided with the first and second reflecting surfaces with the apex angle therebetween, and the light from the light source is reflected by the first reflecting surface. The light that is incident on the modulation element and is modulated and reflected by the light modulation element is reflected by the second reflection surface and emitted in substantially the same direction as the light incident on the first reflection surface.

Further, according to the present invention, in each configuration described above, the color synthesis mechanism is configured as an L-shaped prism provided with a wavelength selection film surface.
Furthermore, an image display method according to the present invention is an image display method in which a plurality of lights are modulated by light modulation elements to generate modulated light, and these modulated lights are combined to display an image. Oppositely, at least a triangular prism is arranged.

As described above, the image display device and the image display method according to the present invention have a configuration in which the triangular prism is disposed opposite to the light modulation element when performing image display in which light modulation is performed using the light modulation element. Using this triangular prism, it is possible to adjust the incident angle of light from the light source to the light modulation element, and the reflection angle at which the light modulated and emitted from the light modulation element is reflected, for example, to the color synthesizing mechanism.
Accordingly, by appropriately selecting the angle configuration and the arrangement position of the triangular prism, the optical configuration such as the arrangement of the light source and the color synthesizing mechanism, which has been a problem in the past, particularly when using a light modulation element having a one-dimensional spatial modulation type configuration. System arrangement can be simplified.

  The light modulation element has at least a first surface and a second surface, and performs light modulation by changing the diffraction grating structure by relative movement between the first surface and the second surface. In the same way, the arrangement of the light source and the color synthesizing mechanism can be simplified by arranging the triangular prism according to the incident angle of the light incident on the light modulating element and the emission angle of the diffracted light. Can be

  Still further, the present invention provides the above-described configuration in which the triangular prism is provided with the first and second reflecting surfaces with the apex angle therebetween, and the light from the light source is reflected by the first reflecting surface, so that the light modulation element Is reflected by the second reflecting surface, and finally the light reflected from the triangular prism toward the color synthesis mechanism is reflected on the first reflecting surface. It can be set as the structure radiate | emitted in the substantially same direction as the incident light, a color composition mechanism can be arrange | positioned in the emission direction of a light source, and the arrangement structure can be simplified.

  Furthermore, in the present invention, an L-shaped prism provided with a wavelength selection film surface is used as a color composition mechanism, so that the L-shaped prism, the triangular prism, and each color light source can be simply adjusted by adjusting the arrangement. An optical system can be arranged.

  According to the image display device and the image display method of the present invention, the arrangement adjustment of the light source, the light modulation element, and the color synthesizing mechanism can be simplified by arranging the triangular prism so as to face the light modulation element. Can be simplified.

  In the present invention, the light modulation element has a first surface and a second surface, and the light modulation device is configured to perform light modulation by changing the diffraction grating structure by relative movement of the first surface and the second surface. The arrangement of the light source, the light modulation element, and the color synthesizing mechanism can be similarly simplified by arranging the triangular prism in accordance with the incident angle of light to the optical element and the emission angle of diffracted light. .

  Furthermore, in the present invention, by appropriately selecting the angular configuration of the first and second reflecting surfaces of the triangular prism, the light modulated by the light modulation element is colored in substantially the same direction as the light emission direction from the light source. It can be directed to the synthesis mechanism, and the arrangement adjustment of each optical component of the light source, the light modulation element, and the color synthesis mechanism can be simplified.

In the present invention, when an L-shaped prism is used as the color composition mechanism, the arrangement adjustment of the color composition mechanism itself is not necessary, and the arrangement adjustment of each optical component can be simplified.
Alternatively, even when at least two dichroic mirrors are used as the color composition mechanism, the arrangement adjustment of each optical component can be simplified.

  Further, in the present invention, a polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and two light modulation elements corresponding to light of this specific wavelength are provided, so that the light modulation element is damaged. In such a case, it is possible to divide and irradiate light having such intensity as to provide a high-luminance image display device.

  Hereinafter, each example of the best mode for carrying out an image display apparatus and an image display method according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples, and various other modifications are described below. Needless to say, changes are possible.

[1] First Embodiment FIG. 1 shows a schematic configuration diagram of a main part of an example of an image display device of the present invention. In this example, an embodiment in which an L-shaped prism 5 is used as the color composition mechanism 4 is shown. The component shown in FIG. 1 is a portion called an optical engine of an image display device, and includes light sources 1R, 1G, and 1B including, for example, a red laser light source, a green laser light source, and a blue laser light source provided with a beam shaping unit. Yes.

  A one-dimensional spatial modulation type light modulation element corresponding to the light source of each color, for example, a light modulation element 3R made of GLV or the like for performing light modulation by changing the diffraction grating structure by relative movement of the first surface and the second surface. 3G and 3B are arranged.

  In the present invention, the triangular prisms 2R, 2G, and 2B are provided in order to make the illumination light shaped into the respective light modulation elements 3R, 3G, and 3B enter and guide the modulated light to the L-shaped prism 5. The light modulation elements 3R, 3G, and 3B are arranged to face the modulated light incident / exit surfaces.

  In this example, as schematically shown in the cross-sectional configuration of the triangular prism 2 (2R, 2G, and 2B) in FIG. With this apex angle, for example, incident light indicated by an arrow L is reflected by the first reflecting surface 2a and is incident on the light modulating surface of the light modulation element 3, and the modulated light that is, for example, diffracted light in this incident direction. Light is emitted at an angle θ as indicated by an arrow L ′ and reflected by the second reflecting surface 2b so that modulated light is emitted in a direction substantially the same as the incident direction of light from the light source. In FIG. 2, a perpendicular line from the apex angle of the triangular prism 2 to the surface of the light modulation element 3 is indicated by an alternate long and short dash line c.

  For example, when the above-mentioned GLV is used as the light modulation element 3, the angle θ formed by the incident light and the reflected diffracted light is relatively small, for example, about 12 °. The incident angle of light and the outgoing angle after light modulation can be adjusted.

On the other hand, the L-shaped prism 5 provided as the color synthesizing mechanism 4 has two wavelength selection film surfaces 5a and 5b. In this case, one wavelength selection film surface 5a is at an extended position in the light emission direction of the light source 1B. For example, it transmits green light and reflects blue light.
The other wavelength selection film surface 5b reflects red light and transmits green light and blue light.

  The light synthesized in the color synthesizing mechanism 4 is collected by the Offner primary mirror 9 and the secondary mirror 10 and the direction is adjusted by the folding mirror 11 to form a one-dimensional intermediate image. This one-dimensional intermediate image is enlarged and projected by the projection lens 12, scanned by a galvano 13 and a galvano mirror 14 provided almost at the position of the pupil of the projection lens, and reflected by a folding mirror 15 for adjusting the projection direction. Project a dimensional image. The L-shaped prism 5 and the triangular prisms 2R, 2G, and 2B are mechanically fixed, and the light modulation elements 3R, 3G, and 3B are also fixed by adjusting their positions, whereby the color composition mechanism 4 is configured. The

  As described above, when a diffraction grating type element such as GLV is used as the light modulation element, the angle formed by the illumination light incident and reflected light is assumed to be used in a narrow limited range of about 12 °, for example. However, it is difficult to achieve a color composition system in combination with an L-shaped prism as it is, but according to the present invention, as described above, by using a triangular prism having two reflecting surfaces having appropriate reflection angles. The combination with the color synthesizing mechanism 4 can be simplified. As in the above example, the arrangement positions of the illumination optical systems of the respective wavelengths are orthogonalized, or an L-shaped prism is used as the color synthesizing mechanism 4. Thus, the unitization can be performed.

[2] Second Embodiment Next, a second embodiment of the present invention will be described. In this example, an L-shaped prism 5 is used as the color synthesizing mechanism 4 as in the first embodiment, as shown in a plan view of a main part of an optical system called an optical engine of the image display device in FIG. However, in addition to the two wavelength selective film surfaces 5a and 5b, the L-shaped prism 5 has a polarization combining surface 5c for red light, for example, as shown in a schematic plan view in FIG. Further, for example, two sets of triangular prisms 2R1 and 2R2 and light modulation elements 3R1 and 3R2 are provided for red light. Here, assuming that red light incident on the triangular prism 2R1 is P-polarized light and infrared light incident on the triangular prism 2R2 is S-polarized light, the P-polarized light is transmitted through the polarization combining surface 5c, and the S-polarized light is converted. If it is selected so as to have a reflecting characteristic, polarization combining can be performed with the same color as shown in FIG.

By adopting such a configuration, the following advantages can be obtained.
For example, when light of a wavelength with low visibility such as red light is output as high as twice as much as light of other wavelengths to improve the color balance, the intensity applied to the light modulation element with a wavelength with low visibility Is higher than the light modulation element of other wavelengths, that is, for example, only the red light needs to be doubled in output, and the surface of the light modulation element for red light, for example, the GLV, is used for other wavelengths due to light damage. There is a problem that the light modulation element deteriorates faster than the light modulation element.

  On the other hand, with the above-described configuration of the present invention, the light output to each light modulation element can be made comparable, and thereby high output of each color light can be achieved without causing variations in light damage resistance. And a high-luminance image display device can be achieved. FIG. 3 shows an example in which a folding mirror 17 is provided for guiding to the Offner primary mirror 9 in FIG.

  According to the present invention, it is possible to unitize the color composition mechanism of an image display device using a laser light source having a different wavelength and a one-dimensional spatial modulation element, and to improve serviceability such as product reliability, assembly, and repair. Can be improved. Further, since the degree of freedom in arrangement of the illumination optical system is increased, a layout that can be easily adjusted can be realized. The L-shaped prism itself is not novel and has been used for color synthesis of conventional transmissive liquid crystal panels. Up to now, light with a narrow input / output angle such as GLV has been limited. The color synthesizing mechanism for the modulation element has not been realized, but the present invention makes it possible to make the illumination optical system orthogonal as described above, and this L-shaped prism can be used, improving reliability, Cost can be reduced.

[3] Third Embodiment Next, examples in which the color composition mechanism is configured using at least two dichroic mirrors will be described with reference to the drawings.
FIG. 5 shows a configuration diagram of a main part of the image display apparatus in this example, that is, an optical system called an optical engine. In FIG. 5, parts corresponding to those in FIG.

  In this example, the color composition mechanism 4 uses at least two dichroic mirrors 6A and 6B in the illustrated example. In order to guide to the dichroic mirrors 6A and 6B, triangular prisms 2R, 2G, and 2B are arranged to face the light modulation elements 3R, 3G, and 3B corresponding to the respective color lights. Also in this example, the light emitted from each of the light sources 1R, 1G, and 1B is converted into the light modulation elements 3R, 3G by the first reflection surface and the second reflection surface that sandwich the apex angle of the triangular prisms 2R, 2G, and 2B. The modulation light emitted from the light modulation elements 3R, 3G, and 3B is emitted in substantially the same direction as the light emitted from the light source.

  As shown in FIG. 6, one dichroic mirror 6A that combines green light and blue light has a wavelength selection film surface 6a that transmits, for example, green light and reflects blue light, and the other synthesizes each color light. The dichroic mirror 6B is configured to have a wavelength selection film surface 6b that reflects, for example, red light and transmits green light and blue light.

In FIG. 5, the dichroic mirrors 6A and 6B and the triangular prisms 2R, 2G, and 2B are mechanically fixed, and the light modulation elements 3R, 3G, and 3B are fixed by adjusting their positions, so that the color synthesizing mechanism is achieved. Form.
By adopting such a configuration, the angle formed by the illumination light incident angle and the reflection angle, such as GLV, is narrowly limited to about 12 °, as in the examples described in the first and second embodiments. Even in the case of using a light modulation element that is supposed to be used in a range, the arrangement of the color composition mechanism can be simplified by combining with the triangular prisms 2R, 2G, and 2B.

[4] Fourth Embodiment With reference to FIG. 7, an example of a fourth embodiment of the image display device according to the present invention will be described. In FIG. 7, parts corresponding to those in FIG. In this example, two dichroic mirrors 6A and 6B are used as the color synthesizing mechanism 4. However, as in the example described in the second embodiment, a part of one dichroic mirror 6A is polarized. The case where the synthetic | combination surface 6c is provided is shown. Also in this example, for example, two sets of triangular prisms 2R1 and 2R2 and light modulation elements 3R1 and 3R2 are provided for red light. A film having the characteristics of transmitting red light and reflecting S-polarized light through the polarization combining surface 6c using red light incident on the triangular prism 2R1 as P-polarized light and infrared light incident on the triangular prism mirror 2R2 as S-polarized light. A surface.

  By adopting such a configuration, it is possible to obtain the same effect as that of the second embodiment described in FIG. That is, for example, when light of a wavelength with low visibility such as red light is output as high as twice as much as light of other wavelengths to improve the color balance, the light modulation element with a wavelength with low visibility is irradiated. The intensity to be increased with respect to the light modulation elements of other wavelengths, that is, for example, only red light is doubled. As described above, by using two light modulation elements for the red light, for example, It can be avoided that the surface of the light modulation element such as GLV deteriorates earlier than the light modulation elements for other wavelengths due to light damage.

  As a result, the light output to each light modulation element can be made the same level, the light output of each color can be increased without causing variations in light damage resistance, and a high-luminance image display device is achieved. can do.

  As the light modulation element in each of the above-described embodiments, for example, as described above, for example, 1088 GLV elements each having three movable ribbons and fixed ribbons alternately arranged are arranged on a one-dimensional array. Can do. Examples of the GLV element include the following types.

  In the above GLV element, the normal type GLV in which the surface of each ribbon is arranged on one plane when the ribbon is not in operation, and each ribbon is arranged with an angle θ from the plane along the direction perpendicular to the incident light. A so-called blaze type GLV has been proposed. Side surface configurations of examples of these types of GLV elements are schematically shown in FIGS. 8 and 9, 30a indicates a fixed ribbon, 30b indicates a movable ribbon, Li indicates incident light, and Lr (+1) and Lr (-1) indicate ± 1st-order diffracted light, respectively.

In the normal type GLV, as shown in an example of operation in FIG. 8, when the moving amount z1 of the movable ribbon 30b is λ / 4 with respect to the wavelength λ of the incident light, for example, it is reflected in the direction opposite to the incident direction. Folded light (not shown) and ± first-order diffracted light Lr (+1) and Lr (−1) emitted at an angle α from the incident direction are reflected as diffracted light.
As an example, when + first-order diffracted light is used as the modulated light, the apex angle of the triangular prism in each of the above-described examples is selected corresponding to this angle α, and is, for example, 12 ° ± 7.2 °. The

  On the other hand, in the blaze type GLV, as shown in FIG. 9, each ribbon is inclined with an angle θ from a plane along a direction orthogonal to the incident direction. During the operation of the movable ribbon, the movable ribbon 30b is moved so that one of the adjacent fixed ribbons 30a and its surface form a single plane, for example, when the wavelength of incident light is λ, When the optical path difference z2 between the pair of ribbons arranged in parallel on one plane and the pair of ribbons arranged in parallel on the other plane is respectively set to λ / 2, only the + 1st order diffracted light is angled from the incident direction, for example. It is emitted with β.

  In this case, the apex angle of the triangular prism is selected corresponding to this angle β. As an example, for example, the angle is 12 ° ± 7.2 °.

As described above, according to the present invention, the color synthesizing mechanism of the image display apparatus using the laser light sources having different wavelengths and the one-dimensional spatial modulation element can be unitized.
In particular, when the incident / exit angle of modulated light such as GLV type is used in a narrow limited range of about 12 ° ± 7.2 °, the color composition system can be combined with an L-shaped prism or a dichroic mirror as it is. Although it was difficult to achieve this, combining with a triangular prism enables unitization and orthogonalization of the optical system, and improves serviceability such as product reliability, assembly, and repair. Further, since the degree of freedom in arrangement of the illumination optical system is increased, a layout that can be easily adjusted can be realized.

  Although the embodiments and examples of the present invention have been described above, the configuration of the present invention is not limited to the above-described examples, and the arrangement of the optical system of the image display device and the ribbons of the light modulation elements It goes without saying that various modifications and changes can be made without departing from the structure of the present invention in the material of the present invention, the structure of the ribbon support mode, and the like.

It is a schematic block diagram of the principal part of an example of an image display apparatus. It is explanatory drawing of an example of the image projection method. It is a schematic block diagram of the principal part of an example of an image display apparatus. It is a schematic block diagram of an example of an L-shaped prism. It is a schematic block diagram of the principal part of an example of an image display apparatus. It is an arrangement configuration diagram of a dichroic mirror. It is a schematic block diagram of the principal part of an example of an image display apparatus. It is explanatory drawing of an example of a light modulation element. It is explanatory drawing of an example of a light modulation element. It is a schematic block diagram of the principal part of an example of a light modulation element.

Explanation of symbols

1R light source 1G light source 1B light source 2R triangular prism 2B triangular prism 2G triangular prism 2a first reflecting surface 2b second reflecting surface 3R light modulation element 3B light modulation element 3G light modulation element 4 color composition mechanism 5 L-shaped prism 5a wavelength Selection film surface 5b Wavelength selection film surface 5c Polarization combining surface 9 Offner primary mirror 10 Sub mirror 11 Mirror 12 Projection lens 13 Galvano 14 Galvano mirror 15 Mirror 17 Mirror

Claims (25)

An image display device that generates modulated light by modulating light from light sources having different wavelengths, respectively, and displays the image by combining the modulated light with a color combining mechanism,
The light modulation element has a one-dimensional spatial modulation type configuration,
An image display device, wherein at least a triangular prism is arranged to face the light modulation element. The light modulation element has at least a first surface and a second surface, and is optically modulated by changing the diffraction grating structure by relatively moving the first surface and the second surface. The image display device according to claim 1. The triangular prism is provided with first and second reflecting surfaces across an apex angle;
Light from the light source is reflected by the first reflecting surface and is incident on the light modulation element, and light modulated and reflected by the light modulating element is reflected by the second reflecting surface and is reflected by the first reflection surface. The image display apparatus according to claim 1, wherein the image display apparatus emits light in substantially the same direction as light incident on the surface. The triangular prism is provided with first and second reflecting surfaces across an apex angle;
Light from the light source is reflected by the first reflecting surface and is incident on the light modulation element, and light modulated and reflected by the light modulating element is reflected by the second reflecting surface and is reflected by the first reflection surface. The image display device according to claim 2, wherein the image display device emits light in substantially the same direction as the light incident on the surface. 2. The image display device according to claim 1, wherein the color synthesizing mechanism is an L-shaped prism provided with a wavelength selection film surface. 3. The image display device according to claim 2, wherein the color composition mechanism is an L-shaped prism provided with a wavelength selection film surface. 4. The image display device according to claim 3, wherein the color composition mechanism is an L-shaped prism provided with a wavelength selection film surface. 5. The image display apparatus according to claim 4, wherein the color composition mechanism is an L-shaped prism provided with a wavelength selection film surface.   2. The image display device according to claim 1, wherein the color composition mechanism is configured such that at least two dichroic mirrors are arranged.   3. The image display device according to claim 2, wherein the color composition mechanism is configured such that at least two dichroic mirrors are arranged.   4. The image display device according to claim 3, wherein the color composition mechanism is configured such that at least two dichroic mirrors are arranged.   5. The image display device according to claim 4, wherein the color composition mechanism is configured such that at least two dichroic mirrors are arranged. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 1. The image display device according to 1. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 2. The image display device according to 2. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 3. The image display device according to 3. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 4. The image display device according to 4. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 5. The image display device according to 5. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 6. The image display device according to 6. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 8. The image display device according to 7. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 8. The image display device according to 8. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 9. The image display device according to 9. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 10. The image display device according to 10. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 11. The image display device according to 11. The polarization combining surface corresponding to light of a specific wavelength is provided in a part of the color combining mechanism, and the two light modulation elements corresponding to the light of the specific wavelength are provided. 12. The image display device according to 12. An image display method for generating modulated light by modulating each of a plurality of lights by a light modulation element, and combining the modulated lights to display an image,
An image display method comprising arranging at least a triangular prism so as to face the light modulation element.

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